CLAAS Id7657h / 7657h (456) – TR2 Transmission / Steering Control Module: Calibration of the center position of the current steering angle.

This code is generated during the steering system's learning process. It indicates that the system is currently attempting to calibrate the center (straight-ahead) position of the steering angle sensor (Component B117), or that the module has lost its center calibration and requires a relearn procedure to ensure the automatic steering (Auto Pilot / GPS Pilot) functions correctly.

• CLAAS Arion 510
• CLAAS Arion 530
• CLAAS Arion 550
• CLAAS Arion 620
• CLAAS Arion 640
• CLAAS Arion 650
• CLAAS Axion 800
• CLAAS Axion 850
• CLAAS Axion 920
• CLAAS Axion 950
• CLAAS Lexion Combines

1. 1

   Visually inspect the Steering Angle Sensor (CLAAS Component B117) mounted on the steering axle. Ensure the sensor mounting bracket is tight and the linkage is not bent or damaged.

2. 2

   Check the wiring harness between the B117 sensor and the TR2 module. Look for open circuits, short circuits to 12V or ground, and corrosion in the connectors.

3. 3

   Check for related active voltage faults (e.g., code Id762Ch / 413) which indicate a hard electrical failure rather than just a calibration issue.

4. 4

   Perform a sensor range test using a diagnostic tool. Observe the live sensor counts/voltage while turning the wheels left to right. The signal must increase/decrease smoothly without dropping to zero or jumping erratically.

1. 1

   Park the machine on a flat, level surface.

   Park the machine on a flat, level surface.

2. 2

   Ensure the rear wheels (on combines) or front wheels (on tractors) are perfectly centered in the straight-ahead position.

   Ensure the rear wheels (on combines) or front wheels (on tractors) are perfectly centered in the straight-ahead position.

3. 3

   Connect the CLAAS Diagnostic System (CDS) or access the steering calibration menu via the CEBIS display.

   Connect the CLAAS Diagnostic System (CDS) or access the steering calibration menu via the CEBIS display.

4. 4

   Initiate the "Learning steering angle" calibration process.

   Initiate the "Learning steering angle" calibration process.

5. 5

   Center Calibration (Id7657h): With the wheels perfectly straight, validate the center position in the system.

   Center Calibration (Id7657h): With the wheels perfectly straight, validate the center position in the system.

6. 6

   Left/Right Calibration (Id7656h / Id7658h): Turn the steering wheel fully to the right mechanical stop and validate. Then turn fully to the left mechanical stop and validate.

   Left/Right Calibration (Id7656h / Id7658h): Turn the steering wheel fully to the right mechanical stop and validate. Then turn fully to the left mechanical stop and validate.

7. 7

   Save the calibration. If the system persistently tries to run "off-center" during a test drive, or if the calibration fails to save, the B117 sensor is defective and must be replaced.

   Save the calibration. If the system persistently tries to run "off-center" during a test drive, or if the calibration fails to save, the B117 sensor is defective and must be replaced.

8. 8

   If replacement is necessary, install the new sensor and repeat steps 1-7.

   If replacement is necessary, install the new sensor and repeat steps 1-7.